Metal pulley



May 29, 1923.

H. J. GILBERT METAL PULLEY Filed April 5, 1921 s Shets-Shet 1 May 29,1923.

. mswm H. J. GILBERT METAL PULLEY Filed April 5, 1921 '5 Sheets-Sheet 23mlumnnmuuullnmm' f i; lg llllllllllllllli! Ma 29, 1923. 1,4s7-m1 H. J.GILBERT METAL PULLEY' Filed April 5, 121 3 Sheets-Sheet 5 Patented May29, 1923.

mu: meme see icm itle eii e16 TUBING COMPANY, or SAGINAW, MICHIGAI\T,' Aconronnrron or MICHIG METAL PULLEY.

Application filed A ril-5, 1921i" Serial noli'sacsi ToaZZ'whom'it'maycomer n:

Be it knownthat I, HENRY J. GILBERT, acitizen of the United States,residing at Saginaw, inth'e county: of Saginaw and State of Michigan,have invented certain; new-and useful-Improvements in Metal -Pulleys,otwhich the'following is a specification.

invention relatesto metal pulleys and theobject thereof is todevis'easimpleand efficient constru ction ot such a pulley 0f the split typecharacterized 7 more i particularly by the provision "of clamping meansand centering means which are independent of each-"other. Theconstruction suchthat when the two-halves of the pulley are'place'd upon"the shaft the centering means are in positive contact either direct orindirect v with the'shaft and-the rim sections are inpositivebontactwith each other; with the result -that, when the clampingmeans are operated to clain the pulley structure on to; theshaft, thetwo halves cannot be drawn out of theirtrue position with respect totheshaft. At the same time the continuous compression on the shaft dueto the clamping-meansincreases the compression of the Y two halvestowards one' 'another and gives added support for the pulley structureupon the shaft Other'novelandadvantageousfeatures of" 7 surfacescompletely closing the ends oftlie construction such as lightness,strength and ease of putting the pulley structure on and oi the shaftwill be apparent from the descriptionhereinafter given. V

The inventive idea is capable'of being embodied in a variety ofmechanical structures some of-which, for the purpose of illustrating theinvention, are shown in the accompanying drawings, but it'is to beexpressly understood that such drawings are for the purpose ofillustration only and are" not designed to definethe limits ofthe in-'vention, reference being had to the appended claims for this purpose.

In the drawingsFig. 1 is an end elevation of a pulley structureembodying my invention in which'the centering means indirectly contact;and F 19;;- 1 is; a like end elevation of a pulley in which thecentering means contact directly with the shaft; Fig. 2 a section on'the line 2 2 of Fig. 3; Fig. 3 a sec tion on-thelin'e'3 3 of Fig.2; Fig.4 a. sec tion on the line 44: of Fig.3; Fig: 5 an 'ele-' vation of abushingg-Fi ro a section on the line 6- .6 not Fig. 7 a-section on theline' 77 ofgFig 6: 'FigmS a section 'on'the" line 8-8 of Fig.7;vFigs.9,510, 11', 12 and 1% are sectional views illustrating".other 5 formsofthe invention and. Fig. 13 'is" an en'd 'view ofFig: 12.,

Referringto the particularembodiment as shown as-in Figs. 1, and:4,.the' pulley which is of the split type comprises twopulleyhalves,each-'consisting ofa rim section radial webswhich are hereconnected with the 'end edges of the rim sectionsla'ndi a tra ii sverse'web which 'is substantially diat-i metrical; and' also consisting'iof'clamping means? The end webs constitute the' centeringmeans which areindependent of' the:

clampingemeans. As" shown :each pulley half is an integral casting or"structure, tut

invention in its broader aspect is not Iieces sarlly limited to such a'structure inasmuch as it may be built up of different or separate Partso produce the final structure." I

Assh'owii' each pulley half comprises a" semr-circular rimsecti'on 1',two parallel and radialendr webs Q'and transverse or dia-" metrically Idisposed webs consisting of the twoflat portions :3. an'dthe centralsubs'tan tially semi circular' "portion 4, adapted to fit' upon theshaft A: In'the presentinstance:

the webs-*2 "form substantially radial smoothv pulley except fortheshaft'opening5' with the result that the lodge'm'ent or accumulating" ofdust, dirt. or lint is impossible on'or'in' the' pulley; The inneradjacent edgesof the rim sectionsof the two pulleyhalvesfand also theinner adjacent edges of the webs 2 butthej'transvers e 'or diametrical'webs *3 shown inFigs ""3 4 the portib nsig are parallel tothedianietricalline of the split'of are in po'sitive'contact with eachotherwhen; the two pulley halves are brought together,

the pulley and are located'o'n either side of such line": n V x Theinner adj acent edges of the webs "2.

are notonly in positivecontact withfeach other, but they also makecontact with the shaft either indirectly through the bushing 5, F 1;or'dii ectlywith the shaftas "shdwn The bushing which is of the splittype comprises two semi-circular portions 5 having radial lugs 6 whichare adapted to be received in radial openings 7 in the central portion 1of the transverse webs. It will be understood, of course, that thebushing 5 may be omitted and the pulley clamped directly to the shaft asshown in Fig. 1

The clamping means herein shown for receive a wrench or other toolwhereby such bolt can be screwed or unscrewed in the assembly anddisassembly of the pulley. Inasmuch as the transverse webs are not incontact but separated a certain distance as shown in Figs. 2 and 3 andare moreover" resilient, the same may be sprung: toward each other bymeans of the clamping bolts and the pulley halves are thereby securelyclamped together and on to the shaft A.

In practice, in the manufacture of this construction of pulley, the twohalves are first clamped together with a slight strain thereon,whereupon the central opening through the pulley (minus the bushing) isaccurately bored out to the same diameter as the shaft to which thepulley is to be applied. During this boring operation the transversewebs are preferably sprung towards each other, so that when the pulleyhalves are relieved of the clamping pressure the central opening issomewhat out of round. In the case of the bushing the same is turned onthe outside to a true circle and is bored on the inside to a true circleconcentric with the outside. As a result, when the pulley is actuallyapplied to its shaft and clamping bolts are operated, the pulley halvesare brought solidly together with the end webs in contact with the shaftand acting as a centering means and with a resilient clamping pressuredue to the clamping means acting independently of the centering means.

The ulley illustrated in Figs. 1 to 4 is ofsmafl size and therefore hasa single set of clamping bolts. However, this pulley structure may bemade of different sizes, that. is of difierent widths and zdiameters.,For instance in Figs. 6, 7 and 8 I have shown my invention as embodiedin a pulley of wider face or rim than in Figs. 1 to a inwhich case thenumber of clamping bolts is increased, being increased in the presentinstance to two pairs of such bolts 8. In other respects theconstruction is the same as that above described.

In Figs. 9 and 10 I have shown a modified form of construction as to theclamping bolts 13 which are here provided with nuts 14 retained in'aside pocket 15 in the web portions 3, each bolt thus engaging its nut14; instead of engaging a screw threaded bore in suchweb portion.

In the above described embodiments the centering means are websconnected with the end edges of the rim sections but in the broaderaspect of my invention the centering means may be otherwise constructedand otherwise arranged as shown in Figs. 11, 12 and 13. According to thestructure shown in, Fig. 11 the centering means consists-of radial webs16 having central hub openings 17 such webs being connected with the rimsections at points within the line of the edges of such sections. Inother respects the construction is the same as shown in Figs. 2 and 8. 1Y

Referring to the construction shown in Figs. 12 and 13 the centeringmeans consists merely of one set or pair of Webs which moreover arearranged at the central portion of the pulley structure with a set orpair of clamping means arranged on either side and axially thereon. Thecentering means here consists of the webs 18 having central hub portions19, such webs being connected with the central portion of the rimsections. The clamping means comprise transverse members 20 which arespaced apart and, are somewhat resilient and are clamped together bymeans of the bolts 21.

Fig. 14 illustrates a construction according to which the transverse webportions 22 corresponding to the web portions3 instead of beingconnected directlywith the rim sections are here shown as connecteddirectly with the sides of the webs 2 along the lines 23. In otherrespects the construction is the same as shown in Figs. 2 and 3.

I claim:

1. A metal pulley adapted for use on a shaft and formed in two halves,said pulley comprising rim sections, means clamping the pulley on theshaft, and automatic centering means resisting the distorting action onthe rim when the clamping meansare applied, whereby clamping and.centering are simultaneously effected.

2. A metal pulley adapted for use. on a shaft and formed in two halves,said pulley comprising rim sections, means clamping the pulley on theshaft, and automatic centering means connected to the rim sections andsupportmg the same against the distorting strains of the clamping means,whereby clamping and centering are simul-l taneously effected.

3. A metal pulley adapted for use on a ing'action 011 the rim when theclamping means are applied, whereby clamping and centering aresimultaneously effected.

4. A metal pulley adapted for use on a shaft and formed in two halves,such pulley 1 comprising rim sections, clamping means includingresilient webs and clamping bolts cooperating therewith, and centeringmeans sustaining the rim sections against the strains imposed by theclamping means.

5. A metal pulley adapted for use on a shaft and formed in two halves,such structure comprising rim sections, centering means fittingpositively on the shaft and acting to center the pulley sections on theshaft in advance of any clamping action, and clamping means normallyspaced from the shaft and capable of being applied to clamp the pulleyto the shaft without disturbing the centering means.

6. A metal pulley structure adapted for use on a shaft and formed in twohalves, such structure comprising rim sections, clamping means, andcentering means cooperating with the shaft for centering the pulleythereon, said centering means including pairs of webs on opposite sidesof the clamping means and having hub portions bearing on the shaft andacting to resist any non-centering strains incident to the clampingaction.

7. A metal pulley structure adapted for use on a shaftand formed in twohalves,

such structure comprising rim sections,

clamping means connected with said sections andclamping the shaft, andcentering means comprising radial webs connected to the rim sections andhaving hub-portions bearing on the shaft and resistingany deformingstrains applied to the rim sections by the clamping means.

8. A .metal pulley structure adapted for use on a shaft and formed intwo halves, such structure comprising rim sections, clamping meansconnected to said sections and cooperating with the shaft, and centeringmeans connected to said rim sections 1 and cooperating with the shaft,said centeringmeans comprising webs having hubportions fitting on theshaft in advance of the clamping action, and said clamping.

means comprising diametrically disposed webs with central openings forthe shaft, and clamping bolts, the bolt of each pulley half connectingits rim section with the diametrical web of the other-pulley half. v

9. A metal pulley which is split into two halves, each half comprising arim, parallel webs extending radially from the. edges of the rim, and aweb extending transversely and connecting the opposite ends of the rim,and means cooperating with the transverse webs for securing the twopulley halves =tother.

halves, each half comprising arim, parallel webs extending radially fromthe edges of the rim, and a web extendingtransversely and connecting theopposite ends of the rim, and means for securing the two null'ey halvestogether consisting of clamping bolts each anchored in a rimandpassingthrough its transverse web and engaging the transverseweb ofthe other pulley half.

11. Ametal pulley which is split into two halves, each half comprising arim, parallel webs extending radially from the-edges of the rim, and aweb extending transverselyand connecting the opposite ends of the rim,

said transverse web consisting of a central semi-circular portion andtwo flat portions connecting the opposite ends of the rim and arrangedparallel to and inwardly of the diametrical line of split of the pulley,and means for securing the two pulley halves together. v

12. A metal pulley which is split into two 10. metal pulleywhichisspli't'into two.

halves, each half comprising a rim, parallel webs extending radiallyfrom the edges of the rim, and a web extendingtransversely andconnecting the opposite ends of the rim, said transverse web consistingof a central semi-circular portion and two flat'portions connected withthe rim and arranged par allel to and inwardly of the diametrical lineof split of the pulley, and means for securing the two pulley halvestogether consisting of clamping bolts engaging respectively the pulleyrims and the flat portions of the web.

13. A metal pulley which is split into two halves, each half comprisinga rim, parallel webs extending radially from the edges of the rim, and aweb extending transversely andconnecting the opposite ends ofthe rim,and means for securing the two pulley halves together, the adjacentedges of the rims and end webs being in contact when the two pulleyhalves are secured together, and the two transvers webs being separatedand out of contact with each other. v

14. A metal pulley which is split into two halves, each half comprisingarim, parallel: webs extending radially from the edges of the rim, and aweb extending transverselyand connecting the opposite ends of the rim,and means for. securing the two pulley halves together, the twotransverse webs being resilient and separated from each other vbutadapted to be drawn towards eachother, and

clamping means cooperating therewith,

15. A metal pulley which is split into two halves, each half comprisinga rim, parallel webs extending radially from the edges of the rim, and aweb extending transversely and connecting the opposite ends of the rim,said Web consisting of a central semi-circular portion and twoflatportions connected with the rim and arranged parallel to and inwardly ofthe diametrical line of split of the pulley said central portion of thetransverse web forming a central shaft opening when the pulley heivesare together, a split bushing in said central opening, and means forclamping the pulley halves together, the openings in the transverse Webbeing out-ofround when the pulley halves are not clamped together butin-round when clamped together.

16. A metal pulley whichis split into two halves, each halt being aclosed integral structure comprising a riIn and parallel WQlJSerrtenclin radially from the edges of the rim, and a Web extendingtransversely and connecting the opposite ends of the rim, and means forsecuring the two pulley halves together. p V

HENRY J. GILBERT.

